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A three dimensional COMSOL Multiphysics, transient analysis, diffusion model has been adopted to model the transfers of water in the industrial concrete floors. To take into account the different initial saturation levels at the different levels of the slab, the model is divided into three subdomains. The rise of the waterfront is also simulated and the air overpressure thereby developed at the interface is calculated. Comparison of numeric simulations with tests realized in laboratory throw some light on the role of the capillary pressure in the pressure developed in the concrete/cover interface.